Inefficient regular expression complexity in Semver-regex - CVE-2021-43307

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Main Vulnerability Database Vulnerabilities #VU109181

Inefficient regular expression complexity in Semver-regex - CVE-2021-43307

Published: May 14, 2025


Vulnerability identifier: #VU109181
CSH Severity: High
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-43307
CWE-ID: CWE-1333
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient input validation when processing untrusted input with a regular expressions. A remote attacker can pass specially crafted data to the application and perform regular expression denial of service (ReDos) attack.


Affected software

Semver-regex
QRadar Assistant

How to mitigate CVE-2021-43307

Cybersecurity Help is currently unaware of any official solution to address this vulnerability..

Semver-regex - addressed in versions 3.1.4, 4.0.3
QRadar Assistant - update to 3.6.0

External References

Related Security Bulletins